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If f(x) = 3x^2 + 2x, what is f'(2)? (2023)

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Question: If f(x) = 3x^2 + 2x, what is f\'(2)? (2023)

Options:

  1. 10
  2. 14
  3. 12
  4. 8

Correct Answer: 10

Exam Year: 2023

Solution:

First, find f\'(x) = 6x + 2. Then, f\'(2) = 6(2) + 2 = 12 + 2 = 14.

If f(x) = 3x^2 + 2x, what is f'(2)? (2023)

Practice Questions

Q1
If f(x) = 3x^2 + 2x, what is f'(2)? (2023)
  1. 10
  2. 14
  3. 12
  4. 8

Questions & Step-by-Step Solutions

If f(x) = 3x^2 + 2x, what is f'(2)? (2023)
  • Step 1: Identify the function f(x) = 3x^2 + 2x.
  • Step 2: Find the derivative of the function, which is f'(x). To do this, use the power rule: the derivative of x^n is n*x^(n-1).
  • Step 3: Apply the power rule to each term in f(x):
  • - For 3x^2, the derivative is 2*3x^(2-1) = 6x.
  • - For 2x, the derivative is 2.
  • Step 4: Combine the derivatives from Step 3 to get f'(x) = 6x + 2.
  • Step 5: Now, substitute x = 2 into the derivative f'(x). So, calculate f'(2) = 6(2) + 2.
  • Step 6: Perform the multiplication: 6(2) = 12.
  • Step 7: Add 12 and 2 together: 12 + 2 = 14.
  • Step 8: Therefore, f'(2) = 14.
  • Differentiation – The process of finding the derivative of a function, which represents the rate of change of the function with respect to its variable.
  • Evaluation of Derivatives – Substituting a specific value into the derivative function to find the slope of the tangent line at that point.
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